Batman Gothic was written in 1990 by Grant Morrison. I think it was his first Batman title. I found this excellent Deluxe Edition to add to my collection.
GM drew from a variety of original source material for this tale. First, the basic plot- a mysterious person known only as Mr. Whisper is killing mob bosses. This panics them so much that they actually ask for help from Batman. Batman tracks down this killer, who has a connection with the early years of Bruce Wayne, and foils a nefarious plot related to the Gotham Cathedral. There that's all the spoilers you are going to get. This is a story worth reading.
Gothic is presented, by GM, as a "Romance in Five Volumes". The only connection with anything remotely romantic is the prevalence of Mozart's magisterial opera Don Giovanni. In the opera, Don Giovanni is a seducer and libertine (Mozart was inspired by the Baroque author Tirso de Molina's Don Juan character). It is worth noting, in the Opera, Don Giovanni is portrayed as a young, arrogant, and sexually promiscuous nobleman,who abuses and outrages everyone else in the cast until he encounters something he cannot kill, beat up, dodge, or outwit. I can see where this has a subtle connection with Mr. Whisper (once you learn about his history), but fail to see the romantic side of it.
While the character of Mr. Whisper has subtle similarities to the operatic character, there is quite a bit more inspiration drawn from Marlowe and Goethe's Faust. IMHO it has more correlation with Goethe's version than Marlowe's version (Marlowe's Faust and Mephistoles are more vulgar and comical characters). But the concept of the Faustian bargain with Mephistopheles (who gives Faust magical powers for a set number of years, but at the end of the term, the Devil will claim Faust's soul, and Faust will be eternally enslaved) is perhaps the main plot inspiration.
The other hint for gothic inspiration is likely the name of the monk- Manfred. Manfred was a dramatic poem written by Lord Byron, in which Manfred succeeds in challenging all authoritative powers he comes across and refuses to submit to spirits of higher powers. As is obvious there is much in common with Byron's Manfred and Goethe's Faust in the plot.
So if this is such a good story why the 4 stars and not 5? The art, typical of the '90s, is borderline execrable. It has not aged well and was likely not very good to begin with. However, don't let the art stop you- this dark story of Batman his own struggles with his past is quite good. A classy Batman story.